Sandbox

SELECT 
  COUNT(*) 
FROM 
  cscart_ec_hb_facilities 
  LEFT JOIN cscart_ec_hb_facilities_desc ON cscart_ec_hb_facilities_desc.facility_id = cscart_ec_hb_facilities.facility_id 
  AND cscart_ec_hb_facilities_desc.lang_code = 'en' 
WHERE 
  1

Query time 0.00037

JSON explain

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

Result

COUNT(*)
0