SELECT 
  product_id, 
  amount 
FROM 
  cscart_warehouses_sum_products_amount 
WHERE 
  1 
  AND product_id IN (
    132, 2, 3, 4, 8, 11, 12, 30, 31, 46, 56, 81
  )

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "15.16"
    },
    "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": 27,
      "rows_produced_per_join": 27,
      "filtered": "100.00",
      "index_condition": "(`test_uchur_k`.`cscart_warehouses_sum_products_amount`.`product_id` in (132,2,3,4,8,11,12,30,31,46,56,81))",
      "cost_info": {
        "read_cost": "12.46",
        "eval_cost": "2.70",
        "prefix_cost": "15.16",
        "data_read_per_join": "432"
      },
      "used_columns": [
        "product_id",
        "amount"
      ]
    }
  }
}

Result

product_id amount
2 120
2 120
3 8
3 8
4 15
4 15
8 3
8 3
11 100
11 100
12 3
12 3
30 4
30 4
31 3
31 3
46 16
46 16
56 103
56 103
81 31
81 31
132 53
132 53