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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01707dcb78a48c05d5c116e5f9887e7be451607dae743ca328020d05953de8ff' 
  AND token = '1yzy+825GVddPK2NlBGW9E14bq2pSjFJY7SfbG2Pr/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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