Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '286fb64012690cbc63925b7994500580e0a2e401b2efe99c59a26f638c19da43' 
  AND token = '816uP16llPinrl8O2hxqY3ylrLXBQ5qduaLha2cmzwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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