Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b3f405fdeca2818080a476464eb96e2e54cc4f3b876d3c175e4367f52d0873b' 
  AND token = 'iLUJTprvYPthdjDSZzy91R8RYoqrnQa2JH68GSJtOQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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