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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d0f7a4f7b59799481e582977c9dcfb909e4e94981d3f2765b829c60765e13d6' 
  AND token = 'UHnt0LtcO5ZIRb+gk0GzV/8vinHcBDv7HA4Ea1/UUJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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