Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ca39cab3cbdc4f9896e4af93398ca34d333f9ff9690d1e3603deb9f7484b64d' 
  AND token = 'DofI1g3WCaPuelyWW2zPbd3XCCV54f+0oCMUQSTwgWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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