Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5b7ae4bb9ad9e4df02d245bedbde0c2ea7bebf3f65c084b57e81788c76eb0e6' 
  AND token = 'jCR9z0OuaZvGH2ruqElCvfF0Ao0iOJWs8+xisIEAEwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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