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 (
    1, 228, 8, 9, 10, 8483, 71, 4, 2359, 1532, 
    8499, 8502, 8501, 2459, 1528, 2432, 
    2455, 1517, 2438, 8498, 7624, 8484, 
    8497, 2812, 7608, 8485, 1538, 8488, 
    8486, 8492, 8487, 7614, 8503, 8505, 
    7613, 8496, 8489, 7248, 7615, 2465, 
    7290, 8490, 7283, 8491, 8493, 7625, 
    7285, 7294, 7261, 7611, 7612, 2441, 
    7616, 7293, 7279, 7617, 7620, 7618, 
    7619, 7281, 7610, 7277, 7609, 7623, 
    7621, 7622, 2832, 8478, 8474, 8475, 
    6380, 10136, 10137, 8512, 3506, 8513, 
    8510, 4949, 10135, 5985
  ) 
  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 0.00177

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "56.01"
    },
    "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": 80,
        "rows_produced_per_join": 15,
        "filtered": "19.99",
        "index_condition": "(`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_prices`.`product_id` in (1,228,8,9,10,8483,71,4,2359,1532,8499,8502,8501,2459,1528,2432,2455,1517,2438,8498,7624,8484,8497,2812,7608,8485,1538,8488,8486,8492,8487,7614,8503,8505,7613,8496,8489,7248,7615,2465,7290,8490,7283,8491,8493,7625,7285,7294,7261,7611,7612,2441,7616,7293,7279,7617,7620,7618,7619,7281,7610,7277,7609,7623,7621,7622,2832,8478,8474,8475,6380,10136,10137,8512,3506,8513,8510,4949,10135,5985))",
        "cost_info": {
          "read_cost": "54.41",
          "eval_cost": "1.60",
          "prefix_cost": "56.01",
          "data_read_per_join": "383"
        },
        "used_columns": [
          "product_id",
          "price",
          "percentage_discount",
          "lower_limit",
          "usergroup_id"
        ],
        "attached_condition": "((`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_prices`.`lower_limit` = 1) and (`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_prices`.`usergroup_id` in (0,1)))"
      }
    }
  }
}