Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0240437f4f601303ba9e597b929f28a71c3f6caa8f355fceba9e2e2175df17d0' 
  AND token = 'y9ChNRAg/bkBfKSiL7THFDu85tOKCDDQMoiXqVGNXSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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