Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b13575d4a3d35e1f0067029db0252c528f135d05e7a5f4f0d7a22fb1d6e670a1' 
  AND token = 'f36gDLgYKCYJsfsb5u1eYofSzVOCH2p2Hny6cqPV8lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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