Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cdfcd4937de45867b6739676e15602696b29392b81b596245d2826f0488a612' 
  AND token = 'KaTLylNFRwZqfluAa4wvUEWWn4gKJygi7TcFft0Scv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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