SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '4ef669a95c52e2b96e6b306a51fc577dcf5ac93184821fb7a889a24db4625243' 
  AND token = 'NUbwa5nwrrsLwXRwXjzVQzN1WPOSdxoSVV4FkIsN5GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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