SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '1e00af4e83e52cb369bf591fd5753ac82369b141be609b64d59d44082630e3a0' 
  AND token = 'BUbI2lcBqd8IpEmIjZiFw/wkZEEBI24XJqQsOhtVr/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00783

JSON explain

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