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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '371ad964a3b92cbf3b959141037f7d28dad0ec8b267544ad5f7fbc977c427e9b' 
  AND token = '8Z05ojVTPGjazdtS7A7WjAiJSQXg2MN1xUYgLVodxEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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