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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e8217bc6230bb8fbfddc9a56da36df3ce67e490bdf364f3b29fb7b3b54bfc9' 
  AND token = '47a2mZszsZCDpn6rw12bLq8SxdUXQfxc8YfCb891Xt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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