Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f639cb7eae3ce93721eb1ca017b751e126b153db16eee89c9bdf689a11a98d7c' 
  AND token = 'RIFsxRwEXSAAzlaBu8L9sI/FlaNghh19NqWLehilHfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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