SELECT 
  category_id 
FROM 
  cscart_categories 
WHERE 
  company_id = 182 
  AND featured = 1

Query time 0.00408

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "143.52"
    },
    "table": {
      "table_name": "cscart_categories",
      "access_type": "ALL",
      "rows_examined_per_scan": 1378,
      "rows_produced_per_join": 13,
      "filtered": "1.00",
      "cost_info": {
        "read_cost": "142.14",
        "eval_cost": "1.38",
        "prefix_cost": "143.52",
        "data_read_per_join": "46K"
      },
      "used_columns": [
        "category_id",
        "company_id",
        "featured"
      ],
      "attached_condition": "((`cscartdb`.`cscart_categories`.`company_id` = 182) and (`cscartdb`.`cscart_categories`.`featured` = 1))"
    }
  }
}