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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d7f9ccd01f29c6a55a987b92fb54c6e76b5af53aacd4a6fdca15ea1c2f38141' 
  AND token = 'iXJCaTylMK6aFYIG6b2TSvK1oGfMf3RkOdXCX/jZ1G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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