Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff2a51b5493e7220e4d13c2b32f8269aa1528b644c80bc3ec1eebec4ae346cc' 
  AND token = 'VVC3+XVp4FoOLxT+jhBZRcPRsF81Ye01cqOAUNHgr8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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