SELECT 
  delivery_time 
FROM 
  cscart_shipping_time_descriptions 
WHERE 
  shipping_id = 1 
  AND destination_id = '7' 
  AND lang_code = 'en'

Query time 0.00033

JSON explain

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