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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d1897137a7a056261d52cae3a6257c4ccd8c1e0ff44966e72ae297be2dc5403' 
  AND token = 'iMVgKkNp2pcoOIfDv/wf8sGwnmdfeHzjAaKk2TNXLyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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