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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0f955904d107dd740476a562f9d0c7d956ffcd41adfb6af3183e988c2ee7c4' 
  AND token = 'GxVWx2aA82ydiJh12XlWXh7Nq32O3YrbOnyYuX6DboM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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