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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6400acc0cbf1ba15f698fdf48a8c347fa2ff811ee7fa441f6327c5b18dc26d42' 
  AND token = 'OVATaBu00+Gk//cAp1Zvmz5rQiyzW2Wu368Edqnpoww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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