Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '1de17642586380e2c72cb13d712d86ec104818213f6718adbf196a2581789748' 
  AND token = 'QwyyPrvAkKxMkR8VutkkQm4XKnr0ruUhm6GA+dQZcp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00769

JSON explain

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