Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ff40b3ce701d08445ad6a11a65ed0c6db23093f05686daabd8bb96bb1f7ab1' 
  AND token = 'sk3CnNcSBtDvJm21JEpx8bzVAnUsaaEmuoWBuqLxgFU=' 
  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"
    }
  }
}