Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43a3ce510445f66e34fcac21f6bb3c8fc32071b769cab777c3d11539cc8f8639' 
  AND token = 'DuGobRjzXhWdNGI1nENhxXbIL2f0XY8CuN+cvVeVFUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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