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SELECT 
  cscart_ab__gp_locations.*, 
  cscart_ab__gp_location_descriptions.* 
FROM 
  cscart_ab__gp_locations 
  LEFT JOIN cscart_ab__gp_location_descriptions ON cscart_ab__gp_locations.location_id = cscart_ab__gp_location_descriptions.location_id 
  AND cscart_ab__gp_location_descriptions.lang_code = 'ru' 
WHERE 
  1 
  AND cscart_ab__gp_locations.company_id = 1 
  AND cscart_ab__gp_locations.location_id = 0 
  AND cscart_ab__gp_locations.status = 'A'

Query time 0.00006

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}