Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af553361398652f231ab4b8e015289414577df84a232652760ab0f95136bd91b' 
  AND token = 'I6Zk4VajdD4l4Xe2wQ3kPT8zbeMx7C/td1S521i5xqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}