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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e6b95f4244c589d517ea37f0a9e2e814c056e7cdcf19c50f2cc2b241eb7dff' 
  AND token = 'g8BX0CVLxZorhbtnSn13nIg/eEUaw+fpxzfUNP6rUio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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