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 (
    4197, 4198, 4199, 4200, 4201, 6716, 6715, 
    3117, 3119, 3127, 3133, 3141, 3142, 
    6674, 6680, 6692, 6693, 6701, 6707, 
    1417, 1393, 1394, 1395, 1396, 1397, 
    1398, 1399, 1400, 1401, 1402, 1403, 
    1404, 1405, 1406, 1407, 1408, 1409, 
    1410, 1411, 1412, 1413, 1414, 1415, 
    1416, 5107, 5108, 5109, 5110, 5111, 
    5112, 5113, 5114, 5115, 5116, 5117, 
    5118, 5119, 5120, 5121, 5122, 5123, 
    5124, 5125, 5126, 5127, 5128, 5129, 
    5130, 340, 341, 342, 343, 344, 345, 346, 
    412, 413, 414, 1366, 1367, 1368, 1369, 
    1370, 1371, 1372, 1373, 1374, 1375, 
    1376, 1377, 1378, 1379, 1380, 1381, 
    1382, 1383
  ) 
  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 0.00190

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "67.21"
    },
    "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": 96,
        "rows_produced_per_join": 19,
        "filtered": "20.00",
        "index_condition": "(`gaseus`.`cscart_product_prices`.`product_id` in (4197,4198,4199,4200,4201,6716,6715,3117,3119,3127,3133,3141,3142,6674,6680,6692,6693,6701,6707,1417,1393,1394,1395,1396,1397,1398,1399,1400,1401,1402,1403,1404,1405,1406,1407,1408,1409,1410,1411,1412,1413,1414,1415,1416,5107,5108,5109,5110,5111,5112,5113,5114,5115,5116,5117,5118,5119,5120,5121,5122,5123,5124,5125,5126,5127,5128,5129,5130,340,341,342,343,344,345,346,412,413,414,1366,1367,1368,1369,1370,1371,1372,1373,1374,1375,1376,1377,1378,1379,1380,1381,1382,1383))",
        "cost_info": {
          "read_cost": "65.29",
          "eval_cost": "1.92",
          "prefix_cost": "67.21",
          "data_read_per_join": "460"
        },
        "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)))"
      }
    }
  }
}