SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '967ae0546b8b2a10c4206b0896fc166b24a7b8a383291dffb64b76c1d0b7c953' 
  AND token = 'bU/HDDML3gFmHkrRycIZrrVO+ptU974q6/DBjC7UJKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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