Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b0a804bc21e3772852a7be8f2802f7d2f35c12eb19b7209c32d5e9f6f9cf1a2' 
  AND token = '8hL9uoz85pqRjvHb+HERI7sRoH2UbuTbx/U8eHJ6zRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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