SELECT 
  feature_id 
FROM 
  cscart_product_features 
WHERE 
  feature_id IN (
    905, 906, 839, 908, 840, 834, 831, 903, 
    902, 836, 917, 904, 825, 827, 837, 833, 
    913, 901
  ) 
  AND feature_type = 'E'

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "32.26"
    },
    "table": {
      "table_name": "cscart_product_features",
      "access_type": "ALL",
      "possible_keys": [
        "PRIMARY"
      ],
      "rows_examined_per_scan": 136,
      "rows_produced_per_join": 1,
      "filtered": "1.32",
      "cost_info": {
        "read_cost": "31.90",
        "eval_cost": "0.36",
        "prefix_cost": "32.26",
        "data_read_per_join": "2K"
      },
      "used_columns": [
        "feature_id",
        "feature_type"
      ],
      "attached_condition": "((`danishecarter_latest`.`cscart_product_features`.`feature_id` in (905,906,839,908,840,834,831,903,902,836,917,904,825,827,837,833,913,901)) and (`danishecarter_latest`.`cscart_product_features`.`feature_type` = 'E'))"
    }
  }
}