SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '0fcd754371af354e534d39ccaa863817e84bb4a531a87f7e443bed6f33920287' 
  AND token = 'ODwAt2+OghasAffpRA9bhHpIYUkwFMY+KvUfZgV+McQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01072

JSON explain

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