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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c45a4ae665c41982f58a530336c8e5c2e668dc8d54d41b8a1ba47a33c91dd0d0' 
  AND token = 'D+WOdzBuHy3zm1TtgHC92ooKKN8JEiAlBIHHI8P60YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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