SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '04d4576378f35ada95db7642964329bb24c07c6fd9de915009bcfc75275114cc' 
  AND token = 'cuJqYZxche+HpBFPtENX4ZotufMjLJnqTcrVdQDCcXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00811

JSON explain

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