Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7a88b15e07c90857580e6a77b9ead68777fcc8e51222dac30c62889cb19043' 
  AND token = 'YJB+P972MegSHQDOb9tMsAK8d0fERVZYlxGdPVNlucw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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