Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65d8d31e979e5e9ed17d7ed15bec90241022a12c48b25a4b5f483cf88e2da0ac' 
  AND token = 'z7rl8mwCmHV9fFA0Zd9kw/N13+tUMGqc2RVCzjCyH8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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