Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'cad9099337e7d35b619a20e5a9b201d90c6026ac2eb6a22abaf528e10b322eb9' 
  AND token = 'eRox4uYLhLHgxOsWZAZRN8y++/QTOzWnOI7vTpVF79E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00785

JSON explain

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