Sandbox

SELECT 
  product_id, 
  amount 
FROM 
  cscart_warehouses_destination_products_amount 
WHERE 
  product_id IN (280, 281, 282, 283, 284, 278, 279) 
  AND destination_id = 7 
  AND storefront_id = 0

Query time 0.00027

JSON explain

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