Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66a4c469babfbb4579167a8dac9a45016b356a89eb1edc89c828c1be80ca3ac8' 
  AND token = '4Dxhhx9ibavqeZomCgXMRTQdGDmIJFmajPhhMUcUU20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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