Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6490e6d23f3118a47003f9281bd3641030bc3f73e84b82ffb9f3dd061a61b893' 
  AND token = 'vogapV70nQZ4CKNm7MwVvKFix2XD0mTy2GoriKYcFfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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