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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98dedfc811d52995c0dd02e582a7cbab8e810a38c491acb6bc82c1d6f9c4b38a' 
  AND token = '0fUNNjmSb/TpjCOe+2Z7e6JhJDWgKfOvAgpl7ypqAqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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