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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a733b0411bfb34e0ee0a25740835d9c1404073b7eb54eac05943836d1bcffa' 
  AND token = '/DHlxJBRYAjB+YWEClPsSjJWQ4v9dBcdIsE8w+cjPZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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