Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a0b0c5ee0274fd99a2416b3e2a88fb393af01399abbb49c574bf091e67096c4' 
  AND token = 'n9U84/HqGM80KarpoT0UFjVdcFvAhmyFxCXsLzQZpSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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