SELECT 
  product_id, 
  amount 
FROM 
  cscart_warehouses_sum_products_amount 
WHERE 
  1 
  AND product_id IN (
    51, 21, 49, 31, 41, 90, 81, 106, 193, 58, 
    18, 94, 86, 36, 128, 20, 95, 15, 44
  )

Query time 0.00057

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "22.31"
    },
    "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": 39,
      "rows_produced_per_join": 39,
      "filtered": "100.00",
      "index_condition": "(`test_uchur_k`.`cscart_warehouses_sum_products_amount`.`product_id` in (51,21,49,31,41,90,81,106,193,58,18,94,86,36,128,20,95,15,44))",
      "cost_info": {
        "read_cost": "18.41",
        "eval_cost": "3.90",
        "prefix_cost": "22.31",
        "data_read_per_join": "624"
      },
      "used_columns": [
        "product_id",
        "amount"
      ]
    }
  }
}

Result

product_id amount
15 31
15 31
18 34
18 34
20 2
20 2
21 2
21 2
31 3
31 3
36 3
36 3
41 3
41 3
44 4
44 4
49 1
49 1
51 4
51 4
58 35
58 35
81 31
81 31
86 27
86 27
90 1
90 1
94 1
94 1
95 13
95 13
106 22
106 22
128 3
128 3