Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3bb59b0cddb4b0fcf0251c3b90d0c37cc0c068720622ff5fab20ba5deb715f' 
  AND token = '7kaau0nzpnYdmGzX7pUX23lH+ehJo2nqCjl82ihr/GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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