Sandbox

SELECT 
  product_id, 
  amount 
FROM 
  cscart_warehouses_sum_products_amount 
WHERE 
  1 
  AND product_id IN (
    276459, 276460, 276461, 276462, 276463, 
    276464, 276465, 276466, 276467, 276468, 
    276469, 276470, 276471, 276472, 276473, 
    276474, 276475, 276476, 276477, 276478
  )

Query time 0.00017

JSON explain

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