SELECT 
  * 
FROM 
  cscart_mdc_classes 
WHERE 
  1

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "4.74"
    },
    "table": {
      "table_name": "cscart_mdc_classes",
      "access_type": "ALL",
      "rows_examined_per_scan": 13,
      "rows_produced_per_join": 13,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "2.14",
        "eval_cost": "2.60",
        "prefix_cost": "4.74",
        "data_read_per_join": "19K"
      },
      "used_columns": [
        "id",
        "name",
        "description",
        "timestamp",
        "cscart_cat_id"
      ]
    }
  }
}