Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b626bf9f8311111c25ca95f216b65a42fa81572857f702bebf57a5c18a0e2b' 
  AND token = 'o50OWnFTahAu6seQIUQAcwAJq+3xsOYuHwvYJ7+wyhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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