Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e52faaa9fadd66e726a0ca9febb3d94c0efb3e59a87581fc0614cdbd0bef41f4' 
  AND token = 'QYIxfdiBFt7+d6BDaQltMlLlpVniwm68LxgKbA7hRQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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