Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ad6cd9e5358c91befb408ffa612be64b4f50170dd9c167b69b08c295b6ea77' 
  AND token = 'rXpCrNye2UFqxGzLQeLq2pxPCVZU1YrfKmZvCXiSKTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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