SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a08386723b22d587e9b40d1145cc17f47ca66d5a05b4f6c39fda62ed21caaab' 
  AND token = 'gHZpM+zkzULZFw/wJKSQoS7hOtgLvaEmGaFz38UeTaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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