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

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "17.71"
    },
    "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": 31,
      "rows_produced_per_join": 31,
      "filtered": "100.00",
      "index_condition": "(`test_uchur_k`.`cscart_warehouses_sum_products_amount`.`product_id` in (15,18,20,21,31,36,58,81,86,90,94,95,106,128,193))",
      "cost_info": {
        "read_cost": "14.61",
        "eval_cost": "3.10",
        "prefix_cost": "17.71",
        "data_read_per_join": "496"
      },
      "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
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

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
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

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
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

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
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