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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78ecac2d60cc7fec7f22fafa3568a8be9e89710a90eb05e3f6c2a10cef132c1e' 
  AND token = 'LoOhh3+aJuMzgphUVKnfJ2aT6oZYzE/VN8yB2k6wzEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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