Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '761f76fa62402347406832bc188be7afe58da9461433bd5028bfd8d4f426ad66' 
  AND token = 'wMlX3o5d0nNLC1ksKuI+MZBwsLsENdM5ItcOm1Olr2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00756

JSON explain

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