Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e8372af5ef777e523e7a18434504e6b0d4e8933ce6a93e17b2b193cbf02280' 
  AND token = '4Vr+PGRbEsU4Eot0X1WEqip9ESf+W53sHhbDvyWuUTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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