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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c310536ceb816c88fb8987eb49437c29ace5c3bb08a8d92cf3eb8dd96c81a5' 
  AND token = 'P6/9G6a6+dRCjVxxy0Ty/DQKmMo6QQtEonEo7MSpKYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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