Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35fa28fdf061323bc103c4f06929e5406d9d501c59bf328aa10209cc7d738f28' 
  AND token = 'kfO9KR4f5DnuCfnJJ0of9rqAcssHisMcXPmFA8CgyU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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