Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '312bc69bd5aad5d18f261a511201d2bfe4b99bb701c40d7fc0ca5c96b447770f' 
  AND token = 'KteAyqrnQzpu+CaP3Plr2KDeKKld83gvmFHhBtihEgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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