Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ccb950ab8b25f347350030fe121aabd310fb8e5ed133e3f76b4d56c41570287' 
  AND token = 'vs/UQKMOk80gSPgblj5d1wDO/4nIf8cxs06QBBs4QEQ=' 
  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"
    }
  }
}