Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8a16cf80e97c091c3bf09ebaccbe531aeb1e9701e61d8e72fc23d80f947546b' 
  AND token = 'bKgi/Fk3f4hOsBSOJNf3vJv+5HFn0OWGeuK4humFC2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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