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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd238c1fa21b248c48f2ad4eec964ea5a19336024ce69787a2b9fbc9a75053aad' 
  AND token = 'FgeravoVNZWIkMXeirKVPHY/4uyeUWAHRTlE7S9wf8I=' 
  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"
    }
  }
}