Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff68bcfd7d8452cf0f89e9a28d09c402d8e3f462228ece8ee08f74139542ecfc' 
  AND token = '/JUfibHYw/7mPghS5jB4fnc5MAfD26bmRP6dgr76M2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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