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SELECT 
  product_id, 
  amount 
FROM 
  cscart_warehouses_sum_products_amount 
WHERE 
  1 
  AND product_id IN (
    276607, 276608, 276609, 276610, 276611, 
    276612, 276613, 276614, 276615, 276616, 
    276617, 276618, 276619, 276620, 276621, 
    276622, 276623, 276624, 276625, 276626
  )

Query time 0.00055

JSON explain

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