Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '537494fdc8557c6c3a75bbe2c4a6e456e3dbb6566713b7d4648cb8dba7b2850f' 
  AND token = '26UUp/zjobnUYe/4qJ6u0trnDlLMVqO8YvZg3no7ArY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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