Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ac95e8bd7ec5e964ebff834348f257bc61c26e7a44497008a0a9bfe764cac5' 
  AND token = '5bX4aVdVh6dpCULyN+Lx+bMVkRzLXsE/lF3rXpQJMsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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