Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0b50f615eeaac9d2574b7481f63c0fcf8755c5c19b0c386fb804a093ab38ad1' 
  AND token = 'pRnSjj9OkbF6nYEyeZNC2cszDzeBQmQGUJy1A/iiwPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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