SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad77b034c65f4c10318b77e71c9d83df7676a384490e052a94fdb955c7aaa43' 
  AND token = 'C4lTEJF6X0nly7h3zWx2ZPHenbjlV/mqdFljVCQmoKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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