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SELECT 
  product_id, 
  amount 
FROM 
  cscart_warehouses_sum_products_amount 
WHERE 
  1 
  AND product_id IN (
    276594, 276595, 276596, 276597, 276598, 
    276599, 276600, 276601, 276602, 276603, 
    276604, 276605, 276606, 276607, 276608, 
    276609, 276610, 276611, 276612, 276613
  )

Query time 0.00026

JSON explain

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