Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b8b952c6bfb7a661d1818a77efab5c5973dfce8eecdc5e5fc7347332a3e1834' 
  AND token = '/2onYdtN9l/bO7WFq/KZ6bqh6DHpMq0A5VYaaROAhxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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