SELECT 
  feature_id 
FROM 
  cscart_product_features 
WHERE 
  feature_id IN (
    661, 653, 660, 652, 649, 646, 658, 648, 
    656
  ) 
  AND feature_type = 'E'

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_product_features",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["feature_id"],
          "rows": 9,
          "filtered": 100,
          "index_condition": "cscart_product_features.feature_id in (661,653,660,652,649,646,658,648,656)",
          "attached_condition": "cscart_product_features.feature_type = 'E'"
        }
      }
    ]
  }
}