Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6329e933c5cd1a1b5c59b9e2e8696561a4468cd126389dc3b13b2634ad036a6b' 
  AND token = 'UqXn0ufuUDwPrl1sC+52EslFBrdZZi665sWQsInklZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00124

JSON explain

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