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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60174e975cc19fda47c6935916e3f96cc10d55bca5b5ad68a6267a120e8941ee' 
  AND token = 'gDXo4XdQwaMW1TsvgxFBd6Z+n1DMsJE6vDlhNnl7n64=' 
  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"
    }
  }
}