SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2beb10595d29cf9324c89ce4f5595cce9ceae7e7ef3c1a8cb0eafd8733f48336' 
  AND token = 'lKDCZx/5uFvUXwH1mQZjKyUvDFuR36AFwPG/CL8kPzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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