SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '9be6a4b55ccb29f23a364f2d86897b8727cfb7cc0eb9f47f5c7009c7e6d580a4' 
  AND token = 'NhZgPtfkzPJ1IANvOqPzIOhdooXLv83oRSjUOXCDfB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00806

JSON explain

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