Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb4fa4cc2d49fa3fc8eaf22e52fb7783e39e52f0c21e74042f9b1d6b9b36392' 
  AND token = 'Xdps02kj/sqo2mDjaHoEXnH8QdBO3MKthpBYKJyFRr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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