SELECT 
  filter_id, 
  feature_id 
FROM 
  cscart_product_filters 
WHERE 
  status = 'A'

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_filters",
      "access_type": "ALL",
      "rows": 4,
      "filtered": 100,
      "attached_condition": "cscart_product_filters.`status` = 'A'"
    }
  }
}