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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ad1927c2c8b64dd65c34aef8e9ff415c27e9572dabbf6705f2a8c63c5b6d7ca' 
  AND token = '+HzPYdDVK7tvtxb33ZbrzwQxp4siG0A6l9H1URILN6w=' 
  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"
    }
  }
}