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 (
    8663, 8779, 8562, 8657, 8689, 8627, 8619, 
    8766, 8838, 8936, 10020, 8910, 8731, 
    10167, 8573, 8916, 8601, 8568, 8655, 
    8667, 8618, 8536, 8566, 8776, 8590, 
    8560, 8914, 8933, 8739, 8748, 8629, 
    8775, 8787, 8783, 8737, 8470, 8742, 
    8567, 8815, 8683, 10174, 8575, 9972, 
    10104, 8581, 9952, 9937, 9968, 8538, 
    8572, 8578, 8580, 9969, 10093, 8540, 
    8574, 8605, 8582, 8599, 10021, 8541
  ) 
  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 0.00149

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "42.71"
    },
    "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": 61,
        "rows_produced_per_join": 12,
        "filtered": "19.99",
        "index_condition": "(`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_prices`.`product_id` in (8663,8779,8562,8657,8689,8627,8619,8766,8838,8936,10020,8910,8731,10167,8573,8916,8601,8568,8655,8667,8618,8536,8566,8776,8590,8560,8914,8933,8739,8748,8629,8775,8787,8783,8737,8470,8742,8567,8815,8683,10174,8575,9972,10104,8581,9952,9937,9968,8538,8572,8578,8580,9969,10093,8540,8574,8605,8582,8599,10021,8541))",
        "cost_info": {
          "read_cost": "41.49",
          "eval_cost": "1.22",
          "prefix_cost": "42.71",
          "data_read_per_join": "292"
        },
        "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)))"
      }
    }
  }
}