Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2254606e3ef2455f6d6f1fb8bd924e3250fa770ebef440a4d6802196b0e69a1f' 
  AND token = 'jXefqZkZZ9ORgfIWHKa1AviVOLcIEHViaiQoOeksmq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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