SELECT 
  product_id, 
  amount 
FROM 
  cscart_warehouses_sum_products_amount 
WHERE 
  1 
  AND product_id IN (
    51500, 51530, 51510, 51531, 51525, 51503, 
    51499, 51524, 51508, 51504
  )

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "11.06"
    },
    "table": {
      "table_name": "cscart_warehouses_sum_products_amount",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "product_id"
      ],
      "key_length": "3",
      "rows_examined_per_scan": 19,
      "rows_produced_per_join": 19,
      "filtered": "100.00",
      "index_condition": "(`test_uchur_k`.`cscart_warehouses_sum_products_amount`.`product_id` in (51500,51530,51510,51531,51525,51503,51499,51524,51508,51504))",
      "cost_info": {
        "read_cost": "9.16",
        "eval_cost": "1.90",
        "prefix_cost": "11.06",
        "data_read_per_join": "304"
      },
      "used_columns": [
        "product_id",
        "amount"
      ]
    }
  }
}