Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'db4ac4406861b61eac2ea389ed75c68b75fa5038e3190a3f9a0aabd2d709c8a3' 
  AND token = 'RnQjS3f8RM5wQwyylO3B/1/Ce0UQxbLxx8mIFfFZosM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00795

JSON explain

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