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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f24e822bdfef9b3f320d5d367df985e2f7ad0c1e9da1601ddaac4b693b04ad' 
  AND token = '1jj/809cgetD2Xm2ZhF5kbRbAzy+PtuHmO1ntYTgMjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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