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

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.01104647,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_statuses",
          "access_type": "index",
          "key": "status",
          "key_length": "6",
          "used_key_parts": ["status", "type"],
          "loops": 1,
          "rows": 30,
          "cost": 0.01104647,
          "filtered": 100,
          "attached_condition": "cscart_statuses.`type` = 'O'",
          "using_index": true
        }
      }
    ]
  }
}