SELECT 
  cscart_product_prices.product_id, 
  MIN(
    IF(
      cscart_product_prices.percentage_discount = 0, 
      cscart_product_prices.price, 
      cscart_product_prices.price - (
        cscart_product_prices.price * cscart_product_prices.percentage_discount
      )/ 100
    )
  ) AS price 
FROM 
  cscart_product_prices 
WHERE 
  cscart_product_prices.product_id IN (
    2124, 2125, 2126, 2127, 2128, 2129, 3752, 
    3753, 3754, 3755, 3756, 3757, 3758, 
    3759, 3760, 3761, 3762, 3763, 3764, 
    3765, 3766, 3767, 3768, 3769, 3770, 
    3771, 3772, 3773, 3774, 3775, 3776, 
    3777, 1143, 1139, 1140, 1141, 1142, 
    3681, 3682, 3683, 3684, 3685, 4890, 
    2207, 2208, 2209, 2210, 2211, 2212, 
    2213, 2214, 2215, 2216, 5808, 5809, 
    5810, 5811, 5812, 5813, 5814, 5815, 
    5816, 1654, 1655, 1656, 1657, 1658, 
    1659, 1660, 1661, 1662, 1663, 1664, 
    1665, 1666, 1667, 1668, 1669, 1670, 
    1671, 2220, 2221, 2222, 2223, 5353, 
    5354, 5355, 5356, 5357, 5358, 5359, 
    5360, 5361, 5362, 5363, 5364
  ) 
  AND cscart_product_prices.lower_limit = 1 
  AND cscart_product_prices.usergroup_id IN (0, 1) 
GROUP BY 
  cscart_product_prices.product_id

Query time 0.00150

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "67.66"
    },
    "grouping_operation": {
      "using_filesort": false,
      "table": {
        "table_name": "cscart_product_prices",
        "access_type": "range",
        "possible_keys": [
          "usergroup",
          "product_id",
          "lower_limit",
          "usergroup_id"
        ],
        "key": "product_id",
        "used_key_parts": [
          "product_id"
        ],
        "key_length": "3",
        "rows_examined_per_scan": 97,
        "rows_produced_per_join": 19,
        "filtered": "20.00",
        "index_condition": "(`gaseus`.`cscart_product_prices`.`product_id` in (2124,2125,2126,2127,2128,2129,3752,3753,3754,3755,3756,3757,3758,3759,3760,3761,3762,3763,3764,3765,3766,3767,3768,3769,3770,3771,3772,3773,3774,3775,3776,3777,1143,1139,1140,1141,1142,3681,3682,3683,3684,3685,4890,2207,2208,2209,2210,2211,2212,2213,2214,2215,2216,5808,5809,5810,5811,5812,5813,5814,5815,5816,1654,1655,1656,1657,1658,1659,1660,1661,1662,1663,1664,1665,1666,1667,1668,1669,1670,1671,2220,2221,2222,2223,5353,5354,5355,5356,5357,5358,5359,5360,5361,5362,5363,5364))",
        "cost_info": {
          "read_cost": "65.72",
          "eval_cost": "1.94",
          "prefix_cost": "67.66",
          "data_read_per_join": "465"
        },
        "used_columns": [
          "product_id",
          "price",
          "percentage_discount",
          "lower_limit",
          "usergroup_id"
        ],
        "attached_condition": "((`gaseus`.`cscart_product_prices`.`lower_limit` = 1) and (`gaseus`.`cscart_product_prices`.`usergroup_id` in (0,1)))"
      }
    }
  }
}