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SELECT 
  product_id, 
  amount 
FROM 
  cscart_warehouses_sum_products_amount 
WHERE 
  1 
  AND product_id IN (
    276643, 276644, 276645, 276646, 276647, 
    276648, 276649, 276650, 276651, 276652, 
    276653, 276654, 276655, 276656, 276657, 
    276658, 276659, 276660, 276661, 276662
  )

Query time 0.00024

JSON explain

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