SELECT 
  exclude_date 
FROM 
  cscart_exclude_shipping_date

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_exclude_shipping_date",
      "access_type": "ALL",
      "rows": 22,
      "filtered": 100
    }
  }
}