Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b4b5d98f9d594eb8eb100ffbb4ecfa90299d9a36ef82cf563a5df96878de039' 
  AND token = 'ZygBjN1rpz2ayXJfPXlCwKdQXWByqeThe6o97Oj4CVk=' 
  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"
    }
  }
}