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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a6898ff9589e9b6d8b7c3169f3fea1bd718652ad0aa03e5c0c1a61f6fef95b9' 
  AND token = 'wblD3hQWxJxNQneA4P3lVyNOYmxj4HSt7FLRjKa5Gkc=' 
  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"
    }
  }
}