SELECT 
  status_id, 
  status 
FROM 
  cscart_statuses 
WHERE 
  type = 'O'

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_statuses",
      "access_type": "ALL",
      "rows": 21,
      "filtered": 100,
      "attached_condition": "cscart_statuses.`type` = 'O'"
    }
  }
}