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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd5a4eedf94d507a7d802e94b5accc575366f8f303b46a12bdad7d4c8aff65ab' 
  AND token = 'PMX/t8HgsXOWp+Rvrds2V9i1yMmEkKY1F1jSQoQHISQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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