Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64de265c50b809ff5a33c11aa975b13a2d85eeb50245d11678b09efdccd4e4a0' 
  AND token = 'FkhiQupaRSrQs/ktaut2hUR5/VN6/weS/DcVObHKTjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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