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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411ece742f05ac31f557eef21531cdae7a83711578c001f678b5044c5a6dbc06' 
  AND token = 'GZMgmIOJw7VbZAtlrekAQbaboTf3vJOq1YuGOyrfBPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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