Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabcc0f1eb1adeed11e6564aba9b0ce85825c4ff3479c5ead93c28eafc9a6d76' 
  AND token = 'RRavdplYXYkcLJ+CSd7ZaSTuNYECfgj8Tx2Dt5VyArk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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