SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '9097c53b2c2d59bc36942ad6ebf4717df5251e31a4ab38c16b5c922c168f4d24' 
  AND token = 'OBqjzIwARqAOWRwZEeUndEdnE7BGBFwExKpTHjOLil4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00749

JSON explain

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