Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '5a21e560394fd867eae0df56696858382ca0c20e3a06976cce6587bf32ed2c34' 
  AND token = 'r4Ch0XEieJlLqx9IhYNyAEPGRIsKwftIth2I4f9kQpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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