SELECT 
  product_id, 
  amount 
FROM 
  cscart_warehouses_sum_products_amount 
WHERE 
  1 
  AND product_id IN (
    51030, 51032, 51070, 51035, 51059, 51066, 
    51041, 51038, 51023, 51039, 51056, 
    51069, 51040, 51050, 51065, 51036, 
    51037, 51052, 51068, 51009, 51034, 
    51061, 51064, 51055, 51071, 51058
  )

Query time 0.00057

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "28.11"
    },
    "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": 48,
      "rows_produced_per_join": 48,
      "filtered": "100.00",
      "index_condition": "(`test_uchur_k`.`cscart_warehouses_sum_products_amount`.`product_id` in (51030,51032,51070,51035,51059,51066,51041,51038,51023,51039,51056,51069,51040,51050,51065,51036,51037,51052,51068,51009,51034,51061,51064,51055,51071,51058))",
      "cost_info": {
        "read_cost": "23.31",
        "eval_cost": "4.80",
        "prefix_cost": "28.11",
        "data_read_per_join": "768"
      },
      "used_columns": [
        "product_id",
        "amount"
      ]
    }
  }
}