Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ca4c3e4509df5fb7e54fbeeb5165f5f56afd4bb02992b3e3a9114d23e5bc2b' 
  AND token = 'vJnE7gCat5rz0enoR+GBdce/CMSeLDMiQiJ+VtTolpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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