Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c40dc17d826b4748b974664df0708552137042ef3500a716e1d8b51d95f342fb' 
  AND token = 'WEUSwxCQnJstmGX1rSjBXvU1dJBHJzzPAR06ttn0I/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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