SELECT 
  cscart_payments.*, 
  cscart_payment_descriptions.*, 
  IF (
    ISNULL(cscart_addons.status), 
    "A", 
    cscart_addons.status
  ) AS processor_status, 
  cscart_payment_processors.type AS processor_type, 
  cscart_payment_processors.processor_script AS processor_script 
FROM 
  cscart_payments 
  LEFT JOIN cscart_payment_descriptions ON cscart_payment_descriptions.payment_id = cscart_payments.payment_id 
  AND cscart_payment_descriptions.lang_code = 'ru' 
  LEFT JOIN cscart_payment_processors ON cscart_payment_processors.processor_id = cscart_payments.processor_id 
  LEFT JOIN cscart_addons ON cscart_payment_processors.addon = cscart_addons.addon 
  LEFT JOIN cscart_storefronts_payments AS storefronts_payments ON storefronts_payments.payment_id = cscart_payments.payment_id 
WHERE 
  cscart_payments.status = 'A' 
  AND (
    cscart_payments.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, cscart_payments.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, cscart_payments.usergroup_ids
    )
  ) 
  AND (
    storefronts_payments.storefront_id = 1 
    OR storefronts_payments.storefront_id IS NULL
  ) 
HAVING 
  processor_status = 'A' 
ORDER BY 
  cscart_payments.position

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "20.73"
    },
    "ordering_operation": {
      "using_temporary_table": true,
      "using_filesort": true,
      "cost_info": {
        "sort_cost": "9.00"
      },
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_payments",
            "access_type": "ALL",
            "possible_keys": [
              "c_status"
            ],
            "rows_examined_per_scan": 9,
            "rows_produced_per_join": 1,
            "filtered": "11.11",
            "cost_info": {
              "read_cost": "4.06",
              "eval_cost": "0.20",
              "prefix_cost": "4.26",
              "data_read_per_join": "2K"
            },
            "used_columns": [
              "payment_id",
              "company_id",
              "usergroup_ids",
              "position",
              "status",
              "template",
              "processor_id",
              "processor_params",
              "a_surcharge",
              "p_surcharge",
              "tax_ids",
              "localization",
              "payment_category"
            ],
            "attached_condition": "((`44mm_ru`.`cscart_payments`.`status` = 'A') and ((`44mm_ru`.`cscart_payments`.`usergroup_ids` = '') or find_in_set(0,`44mm_ru`.`cscart_payments`.`usergroup_ids`) or find_in_set(1,`44mm_ru`.`cscart_payments`.`usergroup_ids`)))"
          }
        },
        {
          "table": {
            "table_name": "cscart_payment_descriptions",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "payment_id",
              "lang_code"
            ],
            "key_length": "9",
            "ref": [
              "44mm_ru.cscart_payments.payment_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 1,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "1.00",
              "eval_cost": "0.20",
              "prefix_cost": "5.46",
              "data_read_per_join": "1K"
            },
            "used_columns": [
              "payment_id",
              "payment",
              "description",
              "instructions",
              "surcharge_title",
              "lang_code"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_payment_processors",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "processor_id"
            ],
            "key_length": "3",
            "ref": [
              "44mm_ru.cscart_payments.processor_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 1,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "1.00",
              "eval_cost": "0.20",
              "prefix_cost": "6.66",
              "data_read_per_join": "3K"
            },
            "used_columns": [
              "processor_id",
              "processor_script",
              "type",
              "addon"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_addons",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "addon"
            ],
            "key_length": "98",
            "ref": [
              "44mm_ru.cscart_payment_processors.addon"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 1,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "1.00",
              "eval_cost": "0.20",
              "prefix_cost": "7.86",
              "data_read_per_join": "1K"
            },
            "used_columns": [
              "addon",
              "status"
            ]
          }
        },
        {
          "table": {
            "table_name": "storefronts_payments",
            "access_type": "index",
            "key": "PRIMARY",
            "used_key_parts": [
              "storefront_id",
              "payment_id"
            ],
            "key_length": "8",
            "rows_examined_per_scan": 9,
            "rows_produced_per_join": 9,
            "filtered": "100.00",
            "using_index": true,
            "using_join_buffer": "Block Nested Loop",
            "cost_info": {
              "read_cost": "2.07",
              "eval_cost": "1.80",
              "prefix_cost": "11.73",
              "data_read_per_join": "144"
            },
            "used_columns": [
              "storefront_id",
              "payment_id"
            ],
            "attached_condition": "(<if>(found_match(storefronts_payments), ((`44mm_ru`.`storefronts_payments`.`storefront_id` = 1) or isnull(`44mm_ru`.`storefronts_payments`.`storefront_id`)), true) and <if>(is_not_null_compl(storefronts_payments), (`44mm_ru`.`storefronts_payments`.`payment_id` = `44mm_ru`.`cscart_payments`.`payment_id`), true))"
          }
        }
      ]
    }
  }
}