Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a51bf39afae0a6b3d682c24411bc97db13532dc98e90162a87cc0225834c3de1' 
  AND token = 'NEuVG5tfztrkfO12xP2Az+MKzBEtlWZoDD+rUutXcM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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