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SELECT 
  product_id, 
  amount 
FROM 
  cscart_warehouses_sum_products_amount 
WHERE 
  1 
  AND product_id IN (
    276439, 276440, 276441, 276442, 276443, 
    276444, 276445, 276446, 276447, 276448, 
    276449, 276450, 276451, 276452, 276453, 
    276454, 276455, 276456, 276457, 276458
  )

Query time 0.00031

JSON explain

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