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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6968e6f93545cc702962db7ef26723c4edf2e5c552406772a7fe423a2935f43a' 
  AND token = 'xNKcKoba9ApRsUpWPa/0llCoV7XsMuZuMbqC00jTw1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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