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 (
    11306, 11446, 11508, 11225, 11337, 11472, 
    11531, 11086, 11166, 11291, 11348, 
    11411, 11477, 11256, 11430, 11479, 
    11126, 11167, 11309, 11520, 11600, 
    11128, 11362, 11414, 11535, 11633, 
    11199, 11390, 11399, 11530, 11236, 
    11289, 11462, 11136, 11193, 11352, 
    11267, 11293, 11308, 11388, 11458, 
    11143, 11231, 11152, 11238, 11439, 
    11453, 11202, 11360, 11198, 11272, 
    11274, 11300, 11500, 11522, 11168, 
    11233, 11287, 11217, 11218, 11226, 
    11271, 11364, 11164, 11232, 11288, 
    11526, 11024, 11080, 11204, 11220, 
    11200, 11270, 10991, 11003, 11211, 
    11216, 11240, 11084, 11210
  ) 
  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 0.00153

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "112.01"
    },
    "grouping_operation": {
      "using_filesort": false,
      "table": {
        "table_name": "cscart_product_prices",
        "access_type": "range",
        "possible_keys": [
          "usergroup",
          "product_id",
          "lower_limit",
          "usergroup_id"
        ],
        "key": "usergroup",
        "used_key_parts": [
          "product_id",
          "usergroup_id",
          "lower_limit"
        ],
        "key_length": "9",
        "rows_examined_per_scan": 160,
        "rows_produced_per_join": 160,
        "filtered": "100.00",
        "index_condition": "((`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_prices`.`lower_limit` = 1) and (`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_prices`.`product_id` in (11306,11446,11508,11225,11337,11472,11531,11086,11166,11291,11348,11411,11477,11256,11430,11479,11126,11167,11309,11520,11600,11128,11362,11414,11535,11633,11199,11390,11399,11530,11236,11289,11462,11136,11193,11352,11267,11293,11308,11388,11458,11143,11231,11152,11238,11439,11453,11202,11360,11198,11272,11274,11300,11500,11522,11168,11233,11287,11217,11218,11226,11271,11364,11164,11232,11288,11526,11024,11080,11204,11220,11200,11270,10991,11003,11211,11216,11240,11084,11210)) and (`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_prices`.`usergroup_id` in (0,1)))",
        "cost_info": {
          "read_cost": "96.01",
          "eval_cost": "16.00",
          "prefix_cost": "112.01",
          "data_read_per_join": "3K"
        },
        "used_columns": [
          "product_id",
          "price",
          "percentage_discount",
          "lower_limit",
          "usergroup_id"
        ]
      }
    }
  }
}