SELECT 
  product_id, 
  amount 
FROM 
  cscart_warehouses_sum_products_amount 
WHERE 
  1 
  AND product_id IN (
    10, 9, 59, 60, 14, 13, 16, 63, 113, 51346, 
    118, 114, 6, 61, 51350, 123, 15
  )

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "20.91"
    },
    "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": 37,
      "rows_produced_per_join": 37,
      "filtered": "100.00",
      "index_condition": "(`test_uchur_k`.`cscart_warehouses_sum_products_amount`.`product_id` in (10,9,59,60,14,13,16,63,113,51346,118,114,6,61,51350,123,15))",
      "cost_info": {
        "read_cost": "17.21",
        "eval_cost": "3.70",
        "prefix_cost": "20.91",
        "data_read_per_join": "592"
      },
      "used_columns": [
        "product_id",
        "amount"
      ]
    }
  }
}