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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd25e27bdc794e03da42d9b4a9d37f62eb85a3d93aaaa72fc09dfec05675eb7d7' 
  AND token = '00Km4XEaNTvGXIzjw30NJ/z/IZsdZ9//zqnyBz1pkxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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